I do not know is this the case with Jolla-C vs Intex but In general Snapdragon processor can be the same but if modem is different then you get different supported frequencies.
https://www.qualcomm.com/products/snapdragon/modems

And for general example modem X5 have multible versions:
https://www.qualcomm.com/products/snapdragon/modems/x5
MDM9628
MDM9625
MDM9320
MDM9225

https://www.qualcomm.com/news/releas...gher-speed-lte
"The new chipsets will support LTE Category 4, offering up to 150 Mbps downlink data rates and 50 Mbps uplink data rates. Other standards supported by the MDM9625 chipset include HSPA+ Release 9, EV-DO Revision B, EV-DO Advanced and TD-SCDMA, while the MDM9225 chipset supports HSPA+ Release 9 and TD-SCDMA."

Edit:
Someone mentioned different frequency ranges so it would mean that compination of Modem or Modem+RF-unit would be different.
https://www.qualcomm.com/news/releas...f360-front-end